Seismic vertical

the point upon the earth's surface vertically over the center of effort or focal point whence the earthquake's impulse proceeds, or the vertical line connecting these two points.

seismic vertical

[′sīz·mik ′vərd·ə·kəl] (geology) The point on the earth's surface directly over the point within the earth from which an earthquake impulse originates. The vertical line between the surface point and the point of origin.

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